How many days will it take a spaceship to accelerate from rest to the speed of light (3.0ã108m/s) with the acceleration g?

Answer is: 354 days.
V = V₀ + g·t.
V - final velocity, V = 3·10⁸ m/s.
V₀ - initial velocity, V₀ = o, because spaceship is in rest.
t - time, how long it takes for spaceship to move from one position to another.
g - gravity, g = 9,8 m/s².
t = V÷g = 3,06·10⁷s = 510204min = 88503,4hr = 354 days.

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